 /*******************************************************************************
  * Copyright (c) 2000, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.externaltools.internal.launchConfigurations;

 import java.util.Comparator ;

 import org.eclipse.debug.ui.RefreshTab;
 import org.eclipse.ui.IWorkingSet;

 /**
  * Comparator for refresh scope launch configuration attribute
  * <code>ATTR_REFRESH_SCOPE</code>.
  */
 public class WorkingSetComparator implements Comparator {

     /* (non-Javadoc)
      * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
      */
     public int compare(Object o1, Object o2) {
         String one= (String )o1;
         String two= (String )o2;
         if (one == null || two == null) {
             if (one == two) {
                 return 0;
             }
             return -1;
         }
         if (one.startsWith("${working_set:") && two.startsWith("${working_set:")) { //$NON-NLS-1$//$NON-NLS-2$
 IWorkingSet workingSet1 = RefreshTab.getWorkingSet(one);
             IWorkingSet workingSet2 = RefreshTab.getWorkingSet(two);
             if (workingSet1 == null || workingSet2 == null) {
                 if (workingSet1 == workingSet2) {
                     return 0;
                 }
                 return -1;
             }
             if (workingSet1.equals(workingSet2)) {
                 return 0;
             }
             return -1;
         }
         return one.compareTo(two);
     }
 }

